Improvement in machines for tapping gas and water fittings



- 3'Shets--Sheet1. G. C. WALWUBTH.

Machines for Tapping Gas and Water Fittings. N0. 144,374. Patented Nov .4,1873.

wghesses.

Juhkf v A My.

, .Imrcn N 6n 3Sheets--Sheet2.

v 0. D. WALWOBTH Machines for Tapping Gas and Waterfitting's. No 144,374, Patented Nov-4,1873.

N": k e is e-s, V x Q" myg zz .3Sheets--Sheet 3. C. G. WALWOBTH.

Machines for Tapping Gas and Water Fittings. N0. 144,374, Patented Nov.4,1873.

yfl o'nesses, Ina auto? V awM- M @OUMAWM 4M. PHUm-UTIIMRMHIC m M X mam/15's P190053} UNITED STATEs PATENT OEEIoE.

CALEB O. WALYVORTH, OF BOSTON, MASSACHUSETTS.

IMPROVEMENT m MACHINES FOR TAPPING GAS AND WATER FITTINGS.

Specification forming part of Letters Patent No. 144,374, dated November 4, 1873; application filed March 15, 1873.

ble those skilled in the art to practice it.

The invention relates to the organization of a screwcutting engine of that class particularly designed for screw-threading pipe-fittings, and for operating upon several fittings simultaneously. More particularly the inven- 1 tion has reference to the peculiararrangement or combination of mechanism by which the screw-cutting tools are automatically advanced to their work and withdrawn therefrom, and to the combination and arrangement of mechanism by which the work-holding vise is operated. Also, to the mechanism for operating the respective jaws or clamps of each branch of the compound vise, so that fittings of varying diameter may be readily clamped.

United States Letters Patent No. 25,779 were granted to me in 1859, for improvements in such machines, and my present invention relates in part to an organization embracing some of the general features shown in said patent.

, The drawing represents a machine embodying my invention.

Figure 1 shows the machine in side elevation. Fig. 2 is a plan of it. Fig. 3 is a ver-' tical cross-section on the line as w and looking toward the gear-train. Fig. 4 shows in section one of the leading-screws and its connections.

0!, denotes a frame; I), an upright having fixedto it nuts 0, in which rotate the leading screws 01 that carry the mandrels or stocks 0 of the traps or screw-cutting tools. There may be any suitable number of these leading-screws for operating cutters to work at the same time upon fittings clamped in the center and side jawsofthevise. The drawing shows a construction for six screws, three for a center and side fittings in the lower jaws of the vise, and three for fittings in the jaws over said lower ones. All the screws of the series are simultaneously operated as follows: Each mandrel is made fast to its screw d by a set-screw or other device, and extends through the screw, and through the nut c, and a quill, f, the nut being fastened to the upright. The quill turns in the nut and is splined to the mandrel, and has a gear-pinion, g, fast on its rear end. The arrangement and connection of the mandrel,

nut, screw, quill, gear, and upright are shown I the gear 0, slides in but rotates with the gear 0.

Each pulley-shaft has two loose belt-pulleys, q'r,

and two friction clutch pulleys, s t, the pulleys s t sliding upon but driving the shafts m, and being driven in one or the reverse direction, accordingly as the pulley s is thrown into connection with the pulley q, or the pulley t into connection with the pulley r, the pulleys s it being clutch or friction pulleys, and the pulleys g 1' open and cross-belt pulleys for driving the respective pulleys s t in opposite directions. The leading-screws d are arranged to advance to prearranged or adjustably-arranged distances, according to the length of screw to be out, and the advance and reverse movements are automatically efi'ected as follows: a denotes a cross-shaft, having shipper-forks 1: extending into grooves w between the respective pulleys of each shaft. Upon the shaft to is fixed a collar, 00, having two shoulders, y

z. a I) denote two catch-pawls, pivoted as seen at c 0 the upper arm of each pawl being pressed against the collar a: by a spring, at", and the lower arm stands in the path of movement of two screws, (1 6 passing through ears f extending from a plate, 9 the shaft -12 passing through the ears f and they having end movement in common with the shaft, by means of collars h fixed upon the shaft. The shaft 11 has upon one end afeed-screw, or feed-regulating screw, 1, turning in a stationarynut, W, and the sh aft is supported by such nut and a bearing, P, in which the shaft slides and rotates. The collar 00 has an arm, on", extending down from it, the end of said arm entering a notch or recess, n formed on the top of abox, 0 through which the shaft 19 runs, the shaft sliding in the box. .VVithin the box is a spring, f, placed between two sleeves, g 1, on the shaft 1), and extending through opposite ends of the box. As the shaft 12 moves in either direction the spring 17 is compressed, the stress of the spring tending to throw the box forward in the same direction, the movement of the box being however prevented, as the arm m is locked by one of the pawls a? W. But when the shaft in its movement causes the screw 01 or e to release the pawl before it from the collar-shoulder the box is free to move, and is then driven forward by the stress of the compressed spring, the spring then'losing its power by its expansion. This movement of the box reverses the position of the collar .00, and enables the other pawl to be pressed under the collar-shoulder by the spring (1 The screws being set or adjusted'to accord with the length of screws to be out upon the fittings, and the shaft being turned back until the screw d releases the pawl a from the shoulder y, permitting the spring 61 to throw the pawl b under the shoulder z, the pulleys s will be clutched to the pulleys q, the belts of which will then, through the train of gearing, rotate all the too1-spindles or mandrels, and the taps or cutters carried by them, so that the tools will advance to their work. The direction of rotation of the shaft 1) is also changed by the action of the pulleys q, and as soon as the shaft, in its forward movement, brings the screw 0 into contact with the pawl b said pawl is tripped from the shoulder '2, when the expansion of the spring will throw the box forward, thereby causing the shipper-lever to carry the clutch-pulleys it into connection with the belt-pulleys r, and the pawl o by the stress of the spring d into engagement with the shoulder y, the parts being then in position for the back movement of the cutting-tools, which movement will thus automatically follow the advance movement of the tools. The vise is fixed upon a vertical spindle, u extending through a slide-plate, "0 that slides 011 guides 20 The vise is made with arms or branches 00 each having a vertical slot, 3 into which the tail-pieces of the clamp -jaws extend.. Each slot has two pairs of jaws, but they are shown in the drawing as extending from only one slot. The lower jaws z have, respectively, right and left hand nut-threads, into which the right and left hand threads of a screw, a extend, and the upper jaws b have similar nut-threads operated by the threads of a screw, 0 above the screw a The screw 0 is tubular, and has fixed to its top a head, 61 having arms by which to turn the screw, and the screw (0 has a spindle, 0 extending through the screw 0 and having at its top a handle, f Under the handle is a washer, g and a pin, h, extends from the handle into the washer, so that the spindle and washer turn together. In the top of the head (i is a groove, 6 and into this groove a pin extends from the washer 9 In griping fittings varying in diameter the smaller one is placed between the jaws a and the other between the jaws b Then the head at is turned, and the end of the slot i striking the pin 00 the two shafts are turned together, both sets of jaws closing until the upper jaws gripe the fitting between them. Then the handle is turned, the pin 00 moving in the slot, imtil the lower jaws gripe the smaller fitting, which they will do before the pin reaches the end of the slot, both fittings being thus griped ready for action of the screw-cutting tools.

The front and side jaws being charged with fittings, the taps cut the screw-threads in the fittings in the six pairs of jaws, and when the cutters move back, and pass out of the threads cut by them, the vise is moved back to clear the fittings from the cutters sufficiently to enable the vise to be moved a quarter-rotation. In my patent No. 25,779 the vise has an upward movement to effect this clearance for its quarter-rotation; but in my present invention the vise is moved back, and is then rotated either by hand or automatically, there being in either case no upward movement.

The back movement is effected as follows:

The vise is jointed, by a link, lc to a pin, 1

on awheehm, fixed on a cross-shaft, n Said shaft has, at one end, a pulley, 0 connected, by a cord, 11 to a lever or arm, g pivoted to the frame a at W; and at the other end a pulley, s carrying a cord, t connected to a spring, u or having hung to it a suitable weight. The lever g passes under a scroll-cam, '0 fixed on the shaft 1), and as the shaft 10, in rotating, frees the cutters from their work the scrollcam, acting upon the lever, depresses it, thereby drawing down the cord p turning the shaft a and causing the link 70 to press back the vise, the shaft turning against the stress of the weight or spring a. The back movement of the vise continues until it has reached such position as to enable it to be freely turned} with its fittings, a concentric part of the cam coming against the lever g so that after the vise has moved far enough continued moveing the vise toward the cutters.

When the vise has reached its proper posi tion for action of the tools, the connection. of

the link 70 to the wheel m will be so far turned as to be on a dead-center, or near enough thereto, to enable the vise to resist the forward I claim-' 1. The combination of the series of nuts 0, screws d, gears g h, shafts i 1', gears k l, and

. pulley-shafts in, substantially as shown and described.

2. In combination with the leading-screws d and the gears g h k l, shafts z, and pulleyshafts m, the sliding clutch-pulleys s t and loose belt-pulleys q 1", arranged substantially as shown and described.

3. In combination with the shaft 12, loosebelt-pulleys q 1', and sliding clutch-pulleys s t the cross-shaft u, shipper-forks e, collar w, an arm m, for automatically effecting the slide movement of the pulleys.

4. Th combination of box 0, spring 1;, collars g 1", stops or screws d 0 collar .10 with its Witnesses FRANCIS GoULn, M. W. FRoTHrNenAu. 

